Volume 5, Issue 9 2100649
Research Article

Anion-Doped Cobalt Selenide with Porous Architecture for High-Rate and Flexible Lithium–Sulfur Batteries

Tao Feng

Tao Feng

Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science & Engineering, Beijing Institute of Technology, Beijing, 100081 P. R. China

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Teng Zhao

Corresponding Author

Teng Zhao

Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science & Engineering, Beijing Institute of Technology, Beijing, 100081 P. R. China

E-mail: [email protected], [email protected]

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Shuangfei Zhu

Shuangfei Zhu

Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science & Engineering, Beijing Institute of Technology, Beijing, 100081 P. R. China

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Nanxiang Zhang

Nanxiang Zhang

Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science & Engineering, Beijing Institute of Technology, Beijing, 100081 P. R. China

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Zhuangzhuang Wei

Zhuangzhuang Wei

Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science & Engineering, Beijing Institute of Technology, Beijing, 100081 P. R. China

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Ke Wang

Ke Wang

Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science & Engineering, Beijing Institute of Technology, Beijing, 100081 P. R. China

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Li Li

Li Li

Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science & Engineering, Beijing Institute of Technology, Beijing, 100081 P. R. China

Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing, 100081 P. R. China

Advanced Technology Research Institute, Beijing Institute of Technology, Jinan, 250300 P. R. China

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Feng Wu

Feng Wu

Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science & Engineering, Beijing Institute of Technology, Beijing, 100081 P. R. China

Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing, 100081 P. R. China

Advanced Technology Research Institute, Beijing Institute of Technology, Jinan, 250300 P. R. China

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Renjie Chen

Corresponding Author

Renjie Chen

Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science & Engineering, Beijing Institute of Technology, Beijing, 100081 P. R. China

Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing, 100081 P. R. China

Advanced Technology Research Institute, Beijing Institute of Technology, Jinan, 250300 P. R. China

E-mail: [email protected], [email protected]

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First published: 15 August 2021
Citations: 26

Abstract

Emerging catalytic host for sulfur is an effective approach to breaking the limits of lithium–sulfur batteries for practical applications. Herein, the hydrangea-shaped Co0.85Se electrocatalyst with macroporous architecture is synthesized. Besides, to improve the electronic conductivity of Co0.85Se, some defects (S-doped) are introduced into the structure of crystals. The S-doped Co0.85Se exhibited an outstanding electrocatalytic effect on lithium polysulfides conversion and can induce and regulate uniform growth of insoluble Li2S on its surface due to the synergistic adsorption by Se and S. As a result, the S/C cathode achieved a high initial capacity of 1340.6 mAh g−1 at 0.5 C and a stable cycling capacity of 666.6 mAh g−1 at 1 C after 500 cycles by 5 wt% Co0.85SeS additions. Moreover, high S loading cathodes are designed through in situ synthesis of Co0.85SeS on flexible carbon cloth (Co0.85SeS@CC). The porous and open framework of Co0.85SeS@CC facilitated electrolyte infiltration and accommodated the volume change of sulfur during the charge/discharge process. Taking by these advantages, a high areal capacity of 9.663 mAh cm−2 is achieved at a high sulfur loading of 9.98 mg cm−2. Even at a high current density of 15 mA cm−2, a reversible capacity of 603.7 mAh g−1 is maintained at a sulfur loading of 6.52 mg cm−2. This proposed work provides a feasible approach to high-rate and flexible Li–S batteries.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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